What should be my next Anti Virus?

Hi, my Kaspersky Anti Virus trial expires tomorrow, and it has been working amazingly, I wish I could get it for free but I can't. So can anyone tell me a good anti virus program that doesn't use a lot of resources, and is good to have while playing full screen games (css, gmod) I can't have it take up a lot of resources because it will lag me. So just please give me a list of best to worst that good, safe, doesn't use lots of recourses, and good at removing viruses. Thanks

I'm not going to get AVG unless if I reinstall my computer, which I don't know how to do. AVG can block viruses well but if you have one and it finds it it's just like 'Oh dude you have a virus, that sucks'.

Searching Google for the shield deluxe returns pcsecurityshield.com as the top result, as well as in an advertisement. pcsecurityshield.com distributes rogue/suspect anti-spyware, according to this page, and McAfee's SiteAdvisor page here lists this as being a bad site.

NOD-32... i am not sure if its free cause i'm using Kaspersky and havent given it a shot.
but both these AV are the BEST n worth paying for.

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I had Kaspersky it was awesome the first time, then 2 weeks after the trial expired I downloaded it again and I had the trial again =). Don't know how that worked. Nod32 was pretty good, but I didn't really know how to remove viruses on it.